Sieve.



' E] u canton H. F. PROHMAN.

SIEVE.

APPLICATION FILED 0OT.20, 1906,

Patented Dec. 28, 1909.

HARRY F. FBOHMAN, 0F CINCINNATI, OHIO.

SIEVE.

Specification of Letters Patent.

Patented Dec. 28, 1909.

Application filed October 20, 1906. Serial No. 339,888.

To all whom it may concern:

Be it known that I, HARRY F. FROHMAN, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Sieves, of whichthe following is a specification.

My invention relates to an improvement in a sieve of the form primarilyadapted to sifting molders sand.

For such use it is desired to have the sieve light, but strong anddurable. Said sieves have a cylindrical body made of wood for lightnessand the usual meshes.

The object of my invention is to preserve the lightness and increase thestrength of the wooden body.

The features of my invention are more fully set forth in the descriptionof the accompanying drawings, forming a part of this specification, inwhich Figure 1 is a bottom plan view of my sieve. Fig. 2 is a sideelevation thereof. Fig. 3 is a section of the body on line 00, Fig. 1.Fig. i is a section of the body on line w, Fig. 1, showing one of thesupporting wires in elevation.

The body of the sieve is made of two hoop sections. 1 represents the topor inner section across the base of which is stretched the usual screenwire 2. This screen wire is turned upward around the outside thereofforming a screen flange 4, as shown in Figs. 3 and 1. The said hoop 1 isbent in circular form having the overlapping ends 5, 6, shown in Fig. 3.The bottom hoop or rim 7 is likewise made of thin material, 8, 9,represent the ends of the same which are tapered and overlap to form thejoint, as shown in Fig. 1.

The screen is made in the usual manner, but I have provided a series ofsupporting wires 10 crossing each other at right angles as shown in Fig.1 and extending upward between the upper and lower rims or hoops, theends of which are bent over and firmly anchored to said former rim, asshown at 11 in Fig. 4:.

11 represent nails driven into the base rim 7 adjacent to the anchoredends of the wires 10 and clenched by contacting against the upwardlyextended portion of the wires between the upper and base hoops, seeFigs. 2 and 4. I

To further support the screen I provide an inside supporting hoop 12,with ends overlapping each other as rims 1 and 7.

15 represents rivets or nails for attaching the inside hoop to the baserim 7.

As the sieves are subjected to great strain and usually employed toscreen damp material the wooden body is subjected to great strains bythe swelling and expansion action of the moisture which is apt to tearloose ordinary fastenings, and render the life of the sievecomparatively short. To further strengthen the body of the sieve andprevent such expansion from tearing apart the joints I provide a seriesof sustaining straps 16, 17 and 18, said straps are arranged and appliedas follows: Strap 16 is bent over the top of the rim 1 forming a limb19, which extends down upon the inside of the sieve and is securedthereto by a clench nail 20.

21 represents a clench nail securing the said clamp to the centralportion of the upper section 1. Said strap is extended down, bent aroundthe base 7 of the sieve, and with a limb 22 turned upon the inside andsecured by a clench nail 15 to the hoop 12 and base rim 7. Straps 17 and18 are secured in a similar manner over the overlapping ends as shown.It will be noticed that the free ends of all of the flaps are firmlysupported and united together to constitute a whole body by the saidstraps 16, 17 and 18. I have found by experience that the abovedescribed screen is very light, strong and durable. These straps limitthe extent of the breakage of the body portion of the sieve, whichwithout them would split the rim its entire circumference.

Having described my invention, I claim A sieve composed of three hoopsections comprising body, base and strengthening hoops, a screen securedbetween the body and base hoops, in combination with a series of wiresspanned beneath the screen with their ends extended upwardly between I

